Information Handling System Network Communication with Through Link Aggregation

ABSTRACT

A client information handling system application selectively communicates network packets simultaneously through plural network interfaces by leveraging network address translation at the network layer of the network packets. Network packets are distributed across the plural network interfaces to achieve desired network communication goals, such as bandwidth, data rates, quality of service, reliability and SAR requirements.

CROSS REFERENCE TO RELATED APPLICATIONS

U.S. patent application Ser. No. ______, entitled “Information HandlingSystem Network Communication with Through Link Aggregation” by Kamal J.Koshy and Sagar S. Samant, Attorney Docket No. DC-109801.01, filed onsame day herewith, which is incorporated by reference in its entirety asif fully set forth herein.

U.S. patent application Ser. No. ______, entitled “Information HandlingSystem Network Communication with Through Link Aggregation” by SinemGulbay and Kamal J. Koshy, Attorney Docket No. DC-109802.01, filed onsame day herewith, which is incorporated by reference in its entirety asif fully set forth herein.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates in general to the field of informationhandling system communication, and more particularly to an informationhandling system network communication with a client through linkaggregation.

Description of the Related Art

As the value and use of information continues to increase, individualsand businesses seek additional ways to process and store information.One option available to users is information handling systems. Aninformation handling system generally processes, compiles, stores,and/or communicates information or data for business, personal, or otherpurposes thereby allowing users to take advantage of the value of theinformation. Because technology and information handling needs andrequirements vary between different users or applications, informationhandling systems may also vary regarding what information is handled,how the information is handled, how much information is processed,stored, or communicated, and how quickly and efficiently the informationmay be processed, stored, or communicated. The variations in informationhandling systems allow for information handling systems to be general orconfigured for a specific user or specific use such as financialtransaction processing, airline reservations, enterprise data storage,or global communications. In addition, information handling systems mayinclude a variety of hardware and software components that may beconfigured to process, store, and communicate information and mayinclude one or more computer systems, data storage systems, andnetworking systems.

Information handling systems often communicate through networks toperform processing tasks. Generally, client information handling systemsestablish communication through a network to a server informationhandling system to retrieve and store information. Different types ofnetworks support different types of communication at different datatransfer rates. For example, a conventional client information handlingsystem may communicate with a local area network (LAN) through a wiredEthernet communication, such as through a CAT 5 cable, through a USB orother serial cable, or through a variety of wireless communicationprotocols, such as a wireless local area network (WLAN) or a wirelesswide area network (WWAN). In a typical enterprise or residentialnetwork, client information handling systems access networks throughaccess points, such as with wireless or Ethernet interfaces. The accesspoints allow multiple clients to interface through the access points andwith external networks, such as through an Internet router interface.

Typically, applications executing on a client information handlingsystem use a single network interface to communicate with externalnetworks. For example, an Internet browser executing on a clientinformation handling system establishes a network interface through aWLAN and uses the WLAN for communication with the network. Althoughother types of network interfaces are available, such as an Ethernet LANinterface or a WWAN interface, the application relies upon only onenetwork interface to communicate with an external network. Someapplications are available that support multiple network interfaces,such as Killer DoubleShot used in gaming. Network traffic is divided byapplication so that a selected application, such as a game that usesnetwork communication, has all of the bandwidth of one network interfaceavailable, such as an Ethernet interface, while other applications sharea separate network interface, such as a WLAN. Such applicationseffectively increase network bandwidth at a client information handlingsystem by allowing simultaneous connections over multiple links.However, total available network bandwidth remains divided where eachapplication has only one link through one network interface.

Although client information handling systems primarily rely upon accesspoints to establish network communication, other less direct networkinterfaces are often available. For example, peer-to-peer networkinterfaces established directly between two client information handlingsystems can provide an indirect network interface. For instance, aclient information handling system that is out of range of a wirelessaccess point (WAP) can interface with the WAP through a peer-to-peerinterface with another client information handling system that has aninterface with the WAP. Similarly, mesh networks provide indirectinterfaces through multiple client information handling systems tosupport a client information handling system communication with adestination, such as a WAP. Although mesh networks tend to involvemultiple transfers between client information handling system, incertain circumstances a mesh network interface can provide substantialbandwidth. For example, a 60 GHz network interface tends to have a shortrange but with a relatively large bandwidth, such as 14 Gbps with aWiGiG 802.11ad link. A difficulty with the use of such peer-to-peer andmesh network interfaces is that the interface is generally not asreliable where a client along the communication link may prioritize itsnetwork needs ahead of other clients, or may simply go out of range,thus breaking the interface. Thus, indirect network interfaces tend tolack quality control and predictable bandwidth so that use of anindirect network interface as an only interface is generally notappropriate for applications that need reliable network service.

Another difficulty that arises with the use of indirect networkinterfaces is that such interfaces tend to rely upon wirelesscommunications using radios. A client information handling systemtypically includes multiple radios that support multiple wirelessinterfaces. For example, WWAN radios communicate over cellular networks,WLAN radios communicate over 2.4 GHz and 5 GHz frequency bands, andshort range high bandwidth WiGiG radios communicate over a 60 GHzfrequency band. In enterprise environments where large numbers ofinformation handling systems operate, wireless frequencies can becomecongested with traffic so that a wireless interface has difficultyfinding an open channel on which to communicate. Wireless congestion canlead to communication performance inconsistencies and poor reliabilityas traffic across enterprise wireless bands varies. Also, networkcommunication through radios is subject to restrictions related to thespecific absorption of wireless signals into end users of a clientinformation handling system. Specific Absorption Rate (SAR)requirements, restrict the amount of radiation from a wireless devicethat can be absorbed by a human body. Although a wireless networkinterface available at a client information handling system may offergreater bandwidth than other options, the actual bandwidth is sometimesrestricted by SAR requirements so that the interface with the greatestbandwidth may not in fact provide the greatest bandwidth where a radioused for a wireless network interface has to reduced power statically ordynamically in response to use cases. Reduced transmit power tends toreduce range and throughput so that data rate and quality of service inthe wireless network tend to suffer.

SUMMARY OF THE INVENTION

Therefore, a need has arisen for a system and method which providesmultiple network mediums to an application for executing on a clientinformation handling system for communication with an external network.

A further need exists for a system and method that manage multiplenetwork mediums for efficient communication by the application with theexternal network.

A further need exists for a system and method that manage radiofrequency absorption related to wireless network communications medium.

In accordance with the present invention, a system and method areprovided which substantially reduce the disadvantages and problemsassociated with previous methods and systems for communication between aclient information handling system and an external network. A clientinformation handling system uses link aggregation to communicatesimultaneously through multiple network interfaces by manipulatingnetwork packets at a network layer rather than an application layer.Network address translation of an Internet Protocol address in thenetwork packet network layer manages network packet assignment toselected of multiple network communication mediums and provides maskingof the multiple communication mediums from the external network. Networkcommunications are optimized with analysis of network communicationmedium states to drive network packets to network communication mediumsefficiently. For example, SAR limits tracked at wireless networkcommunication mediums helps to direct network traffic through networkmedium without impacting wireless transmit power.

More specifically, a client information handling system processesinformation by executing instructions stored in memory on a processorinterfaced with the memory, such as by executing an application. Theclient information handling system includes plural network interfaces tocommunicate with external networks, such as supported by a networkinterface card (NIC) that communicates through wired network interfacesand a wireless network interface card (WNIC) that communicates throughwireless network interfaces. Some examples of network interfaces that aclient information handling system may have include Ethernet, USB orother serial links, 802.11 (b, g, n and ac) wireless local area networksthat operate on 2.4 and/or 5 GHz frequency bands, 802.11ad WiGiGnetworks that also operates on a 60 Ghz frequency band, and otherwireless communication protocols. A link aggregation module cooperatingwith the application and the network interfaces coordinatescommunication of network packets from the application to the externalnetwork through plural of the network interfaces. For example, the linkaggregation module establishes a link aggregation table in cooperationwith an access point that interfaces with the external network. The linkaggregation table relates the application with Internet Protocoladdresses of the plural network interfaces and a port. The linkaggregation module modifies network packets by performing a networkaddress translation at the network layer of the network packet to insertthe multiple network interface Internet Protocol addresses forcommunication to the access point. The access point performs a similarnetwork address translation to send outbound network packets for theapplication under a common aggregated Internet Protocol address. Inboundpackets received at the access point that have the aggregated InternetProtocol address are directed to a selected of the client informationhandling system network profiles with a network address translation atthe network layer that replaces the aggregated Internet Protocol addresswith the desired network interface protocol address. A link aggregationoptimizer analyzes network interface conditions to distributeapplication network packets between the network interfaces in anefficient manner.

The present invention provides a number of important technicaladvantages. One example of an important technical advantage is that aclient information handling system application communicates with anexternal network simultaneously through plural network interfaces. Theavailability of plural network interfaces improves bandwidth at theclient information handling system for more rapid application datatransfers and improves network communication reliability by havingmultiple communication paths to the external network in the event offailures related to any particular network medium. Analyzing availablenetwork mediums and comparing the network medium capabilities againstapplication requirements allows efficient distribution of networkcommunications across the plural network mediums for an improved enduser experience. An aggregated Internet Protocol address coordinatedwith an access point ensures that the external network views theapplication network packets as coming from the same source. Optimizedaggregation of an application's network packets provides the applicationwith simultaneous network access through conventional local area network(LAN) and wireless local area network (WLAN) infrastructures while alsoleveraging indirect external network accesses through peer-to-peer andmesh network infrastructures. Application-specific bandwidth, SARquality of service, and other requirements may be addressed in anoptimal manner on a functional basis, such as by performing large datatransfers through mesh network interfaces in background while carryingvoice with Ethernet and quality of service guarantees. As an example, anaccess point and client information handling system share GigabitEthernet, 802.11ac having 1.3 Gbps (such as 3×3, 80 MHz) and 802.11adhaving up to 7 Gbps. Communicating separately the maximum communicationrate is the maximum speed of the highest speed link. Communicating as anaggregated link, leveraging all three communication links provides adata rate of 9.3 Gbps.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention may be better understood, and its numerousobjects, features and advantages made apparent to those skilled in theart by referencing the accompanying drawings. The use of the samereference number throughout the several figures designates a like orsimilar element.

FIG. 1 depicts a block diagram of an example of client informationhandling systems communicating with external networks;

FIG. 2 depicts a block diagram of an example client information handlingsystem interaction through plural network interfaces to an access pointfor communication with an external network;

FIG. 3 depicts an example network application packet that is presentedto illustrate network translation at the network layer;

FIG. 4 depicts a flow diagram of a process for network addresstranslation at a client information handling system post-routing hookfor a network packet leaving a client a flow diagram of a process;

FIG. 5 depicts a flow diagram of a process for network addresstranslation at a client information handling system pre-routing hook fora network packet arriving at a client application;

FIG. 6 depicts a flow diagram of a process for network addresstranslation at an access point post routing hook for a network packetarriving at the access point from clients;

FIG. 7 depicts a flow diagram of a process for network addresstranslation at an access point pre-routing hook for a network packetleaving the access point towards the client information handling system;

FIG. 8 depicts a block diagram of an example aggregation configurationof multiple client information handling system network interfacesthrough an access point to the Internet;

FIG. 9 depicts a block diagram of an example aggregation configurationconfirmation of multiple client information handling system networkinterfaces at an access point;

FIG. 10 depicts a block diagram of an example of network packetcommunication through multiple network interfaces leveraging clientnetwork interface couplings defined by the network aggregation table;

FIG. 11 depicts a block diagram of selection of client networkinterfaces to optimize desired network communication parameters;

FIG. 12 depicts a flow diagram of a process for adapting availablenetwork interfaces to support an aggregated communication link at aclient information handling system application;

FIG. 13 depicts various tables maintained by a link aggregationoptimizer to aid in the analysis and selection of network interfaces fora client application;

FIG. 14 depicts a block diagram of various factors considered inassignment of network interfaces to an application and distribution ofnetwork packets between the network interfaces; and

FIG. 15 depicts an example flow diagram of a process for adaptivetransmission of network packets with wireless network interfaces.

DETAILED DESCRIPTION

A client information handling system leverages network addresstranslation of a network layer Internet Protocol address to supportapplication interactions through plural network interfaces. For purposesof this disclosure, an information handling system may include anyinstrumentality or aggregate of instrumentalities operable to compute,classify, process, transmit, receive, retrieve, originate, switch,store, display, manifest, detect, record, reproduce, handle, or utilizeany form of information, intelligence, or data for business, scientific,control, or other purposes. For example, an information handling systemmay be a personal computer, a network storage device, or any othersuitable device and may vary in size, shape, performance, functionality,and price. The information handling system may include random accessmemory (RAM), one or more processing resources such as a centralprocessing unit (CPU) or hardware or software control logic, ROM, and/orother types of nonvolatile memory. Additional components of theinformation handling system may include one or more disk drives, one ormore network ports for communicating with external devices as well asvarious input and output (I/O) devices, such as a keyboard, a mouse, anda video display. The information handling system may also include one ormore buses operable to transmit communications between the varioushardware components.

Referring now to FIG. 1, a block diagram depicts an example of clientinformation handling systems 10 communicating with external networks. Inthe example embodiments, client information handling systems 10 arelocated at an enterprise location 16, such as a corporate office, and aresidential location 18. Other example locations may include educationfacilities, government offices, public areas, WiFi hotspots, etc. . . .. In the example embodiment, enterprise location 16 supports a localarea network (LAN) with a server information handling system 12 thatstores enterprise information in a storage device 14, such as an arrayof solid state or hard disk drives. A switch 38 interfaces with server12 to coordinate network traffic from a plurality of network devicesdeployed across the enterprise. The example embodiment depicts portableclient information handling systems 10 that interact through wirelessinterfaces 40, such as 802.11 (b, g, n, ac and ax) wireless local areanetworks (WLANs) supported through wireless access points (WAPs) 36.Within cubicles of enterprise location 16, a variety of networkeddevices may be found, such as desktop information handling systems 42,displays 44 and printers 46. Networked devices interface throughEthernet cables 34, such as CAT V cables, and through wirelessinterfaces. For example, peripherals and docking stations can interfacewith switch 38 through cables 34 and offer high bandwidth short rangewireless networking with 60 GHz wireless interfaces. The exampleembodiment residential location 18 includes a similar local area networkarchitecture with an access point 36 that offers Ethernet ports 32 forcable 34 network interfaces and a radio 30 for wireless networkinterfaces. A controller 28 within access point 26 executes embeddedcode stored in flash memory to manage communication of network packets.

The example embodiment of FIG. 1 depicts a variety of examplecommunication paths for a client information handling system 10 tointeract with an external network, such as Internet 24. Enterpriselocations 16 often have server information handling systems 12 thatinterface with Internet 24 or private wide area networks (WANs) throughdedicated telecommunication lines. Residential locations 18 typicallyrely upon Internet Network Service Providers 20 who provide residenceswith routers and access points to obtain Internet service. Mobiletelephone service providers also offer data access to the Internetthrough distributed wireless wide area network (WWAN). The examplenetworks of FIG. 1 illustrate that a client information handling system10 often has a number of external network interface options available touse for communicating with an external network, such as the Internet 24.Generally, client information handling systems identify themselves withan Internet Protocol address assigned by the network service provider orserver that provides the client with access to the Internet, which istypically tied to the network medium that the client interfaces through.Within a local area network, dynamic assignment of Internet Protocoladdresses is typically managed by a router access point that routesnetwork packets between the local area network and external networks.Those of skill in the art will recognize that the example networkarchitectures set forth in FIG. 1 illustrate network interactions andare not intended to limit the scope of the present disclosure to theexample presented.

Referring now to FIG. 2, a block diagram depicts an example clientinformation handling system 10 interaction through plural networkinterfaces to an access point 26 for communication with an externalnetwork. Client information handling system 10 processes information byexecuting instructions with a central processing unit (CPU) 48cooperating with memory, such as random access memory (RAM) 50.Persistent storage, such as solid state drive 52, stores applications 60and an operating system during system power down. A chipset 54 includesprocessing elements and embedded code stored in flash memory thatcoordinates interactions with CPU 48 and peripheral devices on aphysical level. In the example embodiment, a network interface card(NIC) 56 provides a network interface through one or more wiredconnections, such as Ethernet or a serial interface like USB, and awireless network interface card (WNIC) 58 provides a network interfacethrough one or more wireless connections, such as a wireless local areanetwork (WLAN) or wireless wide area network (WWAN). The exampleembodiment depicts example physical processing components that cooperateto process information and communicate information through pluralnetworks, and is not intended to limit the scope of the presentdisclosure, which may apply across client information handlings having avariety of hardware and software configurations.

In the example embodiment, application 60 sends and receives informationin the form of network packets through an access point 26 simultaneouslythrough multiple network interfaces, such as a wired network interfacesupported by NIC 56 (IP address 192.168.1.2:4243) and a wireless networkinterface supported by WNIC 58 (IP address 192.168.1.3:4243). Themultiple network interfaces are coordinated by a link aggregation module62 at client information handling system 10 and another at access point26, which track coordinated network interfaces at link aggregationtables 64. Link aggregation module 62 is, for example, embedded codestored in flash memory that executes on a processor, controller ordedicated hardware, to manage network packet address translation at thenetwork layer. In one example, software executing under the managementof an operating system coordinates the use of multiple networkinterfaces without the use of specialized hardware. In another exampleembodiment, a digital signal processor (DSP) integrated in chipset 54receives network packets from application 60 that are prepared to sendthrough a single network interface in a conventional manner. Application60, for instance, may have coordinated with an operating system tocommunicate with the Internet through an Ethernet cable coupled to NIC56. Link aggregation module 62 receives the network packets from theapplication, selects a network interface to send the network packet, andperforms a network layer address translation to insert an InternetProtocol address of the selected network interface into the networkpacket. Once the network packet is translated to a selected networkaddress, link aggregation module places the network packet into thenetwork interface device associated with the selected network interfaceand sends the network packet through that network interface to accesspoint 26. Similar handling of incoming network packets providesapplication 60 with access to multiple network interfaces to acceptnetwork packets. As network packets arrive at NIC 56 and WNIC 58, thenetwork packets are forwarded to link aggregation module 62 wherenetwork address translation is performed to insert an Internet Protocoladdress in the network layer that is expected by application 60. Inboundnetwork packets with the translated network address expected byapplication 60 are then forwarded to application 60 for processing in aconventional manner.

In one aspect of the present disclosure, application 60 is provided withmultiple network interfaces through network address translation at aclient information handling system so that application 60 is,essentially, tricked to view the multiple network interfaces as a singleinterface. In order to coordinate network communication for theapplication with an external network, the server information handlingsystem or other target of the application network packets should knowthat network packets from the application have the same sourceapplication even though the source Internet Protocol address reflectsdifferent network mediums of the client. In the example embodimentdepicted by FIG. 2, access point 26 manages the assignment of InternetProtocol addresses so that an aggregated Internet Protocol address ispresented for the application to the external network. In the exampleembodiment, access point 26 assigns an Internet Protocol address toclient information handling system 10 in a conventional manner, such aswith a DHCP dynamic address process that leverages a globally uniqueaddress provided from an Internet Service Provider or enterprise serveror a locally unique IP address like 192.168.x.x. Application 60coordinates external network communication using a network interface andassociated Internet Protocol address assigned by an operating system.Link aggregation module 62 then coordinates the use of multiple networkinterfaces by inserting aggregate Internet Protocol addresses withnetwork address translation. In the example, link aggregation module 62associates in link aggregation table 64 the Internet Protocol addressesof the two selected network interfaces (192.168.1.2 and 192.168.1.3)with a port for application 60 (4243). The association is stored in linkaggregation table 64 of access point 26, where an aggregate InternetProtocol address (41.126.22.35) and port (3423) is also associated withthe application and used through network address translation to presentapplication 60 network packets to an external network as from a samesource address. Although the example embodiment presents the use of anaggregated Internet Protocol address from access point 26, differentaggregations may be used at different network locations, such as bycoordinating the aggregation at the target server of the network packetsitself. For example, a combination of peer-to-peer, mesh and WLANnetwork interfaces may all communicate network packets of a clientapplication to a common location outbound to an external network so thatone or more network address translations are performed at one moreintermediate local area network locations before communication to theexternal network is performed using a common aggregated network layerInternet Protocol address. Ultimately, at egress to the externalnetwork, multiple Internet Protocol addresses of the local area networkare coupled by the egress device, such as an access point, byadvertising the multiple Internet Protocol addresses as a singlepublic/private Internet Protocol address.

Referring now to FIG. 3, an example network application packet ispresented to illustrate network translation at the network layer of aclient information handling system. In the example embodiment, thenetwork packet includes a physical layer 74, such as to track wired orwireless physical interfaces, a data link layer 72, such as that tracksa MAC address of the network device, a network layer 70, such as thattracks source and destination Internet Protocol address, a transportlayer 68, such as that tracks TCP and UDP routing, and an applicationlayer 66 that holds application information. During sending of a networkpacket from a client information handling system application, theapplication provides a partially completed network packet to the networkaggregation module, which, as part of the pre-routing outboundprocessing described below in FIG. 4, replaces the source InternetProtocol address of network layer 70 with the aggregate InternetProtocol address, such as the address of the network interface selectedfrom the network aggregation table to send the network packet. Once thenetwork layer 70 has the network address translated, the network packetis pushed to the network stack for transmission by the defined networkinterface of the client information handling system. A similartranslation takes places for inbound network traffic to clientinformation handling system 10, as described below in FIG. 5. Theinbound network packet is translated at network layer 70 as networkpackets arrive from the network stack with an aggregate InternetProtocol address defined in the network aggregation table. The networkpacket is translated to replace the aggregate address with theapplication network address and then forwarded to the application. Invarious network architectures, the network layer may be managed asappropriate. As described in FIGS. 6 and 7, network address translationis performed at an access point or other external device that receivesand sends network packets to client information handling system 10.

Referring now to FIG. 4, a flow diagram depicts a process for networkaddress translation at a client information handling system post-routinghook for a network packet leaving a client application. Post-routinggenerally refers to processing done on a packet at a client for outboundcommunication. At step 76, a network packet leaving an application forthe network stack is captured when partially formed at the networklayer. At step 78, the source Internet Protocol address of the packet isadjusted to instead have an Internet Protocol address of one of thesupplementary non-default network interfaces. For instance, in theexample embodiment each network packet leaving the application has thenetwork layer Internet Protocol address replaced to use an aggregateaddress from the network aggregate module table. At step 80, the networkpacket network layer checksum is re-computed to consider the translatedInternet Protocol address and added to the network layer. At step 82,the checksum is re-computed for the upper layer protocols and added tothe network packet. At step 84, the output device to receive the networkpacket is set and the network packet is manually set to route to theexit interface for transmission through the associated network interfacewith the translate network address inserted.

Referring now to FIG. 5, a flow diagram depicts a process for networkaddress translation at a client information handling system pre-routinghook for a network packet arriving at a client application. Pre-routinggenerally refers to processing done on a packet a client for inboundcommunication. The process starts at step 88 with capture of an incomingpacket from a network interface off the client information handlingsystem network stack. At step 90, a look is made to the link aggregationtable for the incoming packet and at step 92 a compare is made of thenetwork packet destination Internet Protocol address and portcombination against aggregate network addresses in the link aggregationtable. If the incoming network packet matches an aggregate address, theprocess ends at step 94 with forwarding of the network packet to theclient information handling system. If at step 92 the incoming packetmatches a coupled Internet Protocol address and port of the linkaggregation table, the process continues to step 96 to adjust thedestination Internet Protocol address of the network packet to theaddress and port expected by the client information handling systemapplication as defined in the link aggregation table. The destinationInternet Protocol address is translated and check sum adjusted for thenew address. At step 98, the checksum of the upper layer protocol isadjusted to account for the translated Internet Protocol address. Atstep 100, the network packet is forwarded up the network stack to theapplication for processing.

Referring now to FIG. 6, a flow diagram depicts a process for networkaddress translation at an access point post routing hook for a networkpacket arriving at the access point from clients. Post-routing generallyrefers to processing done on a network packet at an access point forinbound communication from a client information handling system. Theprocess starts at step 102 by listening for new coupled networkaddresses requested by a client information handling system on a definedport, such as port 3423. For example a state machine executing on acontroller of the access point listens for requests with port 3423 andapplies the requests to add or delete coupled relationships of theaccess point's link aggregation table. If a coupling request isreceived, at step 104 an entry is made to the link aggregation table sothat detection of a source Internet Protocol address associated with thecoupling request will result in network translation of the outboundnetwork packet to include an aggregated Internet Protocol address. Atstep 106, network packets coming into the access point are comparedagainst values in the link aggregation table to determine if the sourcesInternet Protocol address matches a value in the link aggregation table.As an example, a state machine or dedicated hardware device compares thenetwork packet and link aggregation table Internet Protocol address todetermine matches. At step 108, as matches are detected, a networkaddress translation is performed to replace the network packet sourceInternet Protocol address with an aggregated Internet Protocol addressdefined by the link aggregation table of the access point, including are-calculation of the network layer checksum to include the aggregateInternet Protocol address. Thus, for instance, network packets from acommon client application received through plural network interfaceswith plural source Internet Protocol addresses are adjusted to have acommon aggregate Internet Protocol address defined by the access point'slink aggregation table. At step 110, the adjusted network packets arefurther processed to replace the transport header port with the mappedport of the link aggregation table and the transport layer checksum isrecalculated. In this manner, network packets from the clientapplication proceed out of the access point presenting an appearance ofhaving been sent through the same client network interface with theaccess point aggregate address masking the local area network at thenetwork layer for address manipulation.

Referring now to FIG. 7, a flow diagram depicts a process for networkaddress translation at an access point pre-routing hook for a networkpacket leaving the access point towards the client information handlingsystem. Pre-routing generally refers to processing done on a packet atan access point for outbound communication to a client informationhandling system. The process starts at step 112 by checking ifdestination Internet Protocol addresses of incoming network packetsmatch an IP address and port of the access point link aggregation table,such as a with a comparison of the packet port and aggregate portsdefined by the link aggregation table. If a match is found, the processcontinues to step 114 to replaces the destination Internet Protocoladdress of the network packet with an Internet Protocol address of thelink aggregation table and recalculate the network layer checksum. In anexample embodiment, the replacement address may be selected from pluralavailable addresses of the link aggregation table where each replacementaddress forwards the network packet to an associated network interfaceof the client information handling system. Selection of an address maybe defined by rules or an optimized analysis of the available networkpaths as set forth below. At step 116, the destination port in thetransport header is replaced with the port from the link aggregationtable and the transport checksum is recalculated. At step 118, thenetwork packet in translated form is then forwarded from the accesspoint to the internal network for communication to the clientinformation handling system through the network interface defined by thereplacement address and port.

Referring now to FIG. 8, a block diagram depicts an example aggregationconfiguration of multiple client information handling system networkinterfaces through an access point to the Internet. In the exampleembodiment, client information handling system 10 includes three networkinterfaces interfaced with a local area network (LAN) 111: an Ethernetinterface 24, a 2.4 GHz wireless interface 40, and a 5 GHz wirelessinterface 42. An access point 26 interfaces with LAN 111 and to Internet24. When an application on client information handling system 10 wantsto interface with Internet 24 using multiple network interfaces, client10 sends a coupling request through any of the available networkinterfaces to the access point to couple the application's networkcommunications through a link aggregation table entry. The couplingrequest is sent from a source port associated with such requests, suchas source port 3423 in the example, to a destination port associatedwith handling such requests, such as destination port 5423 in theexample. Access point 26 listens at the identified destination port forthe request source port and, when a coupling request is detected, entersthe coupling of the client interfaces at a link aggregation table ofaccess point 26. In the example embodiment, coupling of client networkinterfaces is managed with source Internet Protocol addresses and ports,however, in alternative embodiments other types of associations may beused. For example, a client application might gather available clientnetwork interface addresses to send a coupling request to a targetserver information handling system or an intermediate network devicethat aggregates client network packets. In addition, coupling may occurover multiple access points or network devices so that ultimateaggregation of a client application's network packets may occur atmultiple egress points from a local network to an external network. Forinstance, once access point 26 establishes a coupling in a linkaggregation table, the coupling may be forwarded to other links withinLAN 111 so that any link receiving a client application network packetwill translate that network packet to have an appropriate aggregatenetwork address.

Referring now to FIG. 9, a block diagram depicts an example aggregationconfirmation of multiple client information handling system networkinterfaces at an access point. Once access point 26 has entered acoupled address relationship in its link aggregation table, access point26 sends confirmation of acceptance of the aggregation to clientinformation handling system 10 with a duplicate of the original linkaggregation table entry. Client information handling system 10 entersthe confirmed coupling as an entry to the client link aggregation tableand may then initiate the use of any and/or all of the networkinterfaces to communicate application network packets to an externalnetwork. Similarly, access point 26 may send network packets receivedfrom an external network to any of the client network interfaces definedby the coupling of the link aggregation table. As described below ingreater detail, the availability of multiple network interfaces may beleveraged to achieve desired communications goals by selection ofnetwork interfaces associated with the goals, such as bandwidth, qualityof service, etc . . .

Referring now to FIG. 10, a block diagram depicts an example of networkpacket communication through multiple network interfaces leveragingclient network interface couplings defined by the network aggregationtable. Application data from client information handling system 10 issent through any of the three network interfaces 34, 40 and/or 42 withthe network interface's source Internet Protocol address and source port3423, which indicates the coupling to access point 26. As access point26 receives network packets that include port 3423, access point 26identifies the coupling and performs network address translation topresent the client application network packets to Internet 24 as sourcedfrom a common Internet Protocol address and a port of 7423 associatedwith the coupling. In this manner, as data reaches the destination ofeach network packet, the target device sees the network packets ascommonly sourced and processes the network packets as such with responsenetwork packets returned to the access point's “masquerade” destinationInternet Protocol address and port. As access point 26 receives theresponse network packets, with the coupling Internet Protocol addressand port, access point 26 translates the response network packets to oneof the three client Internet Protocol addresses and the client couplingport of 3423 and sends the network packet to the client through thetranslated network address.

Referring now to FIG. 11, a block diagram depicts selection of clientnetwork interfaces to optimize desired network communication parameters.As described above, applications at a client information handling system10 leverage multiple network interfaces to communicate with an externalnetwork by coordinating an aggregate Internet Protocol address throughdefined ports. In complex local area network architectures, such as arecommonly found in enterprise locations, client network interface pathsmay diverge and converge at different locations, including locationsexternal to a local area network. As an example, a client informationhandling system at an enterprise location may include cellular networkdata service through an enterprise account that offers a networkinterface through a wireless wide area network (WWAN) account of theenterprise. Link aggregation that leverages the WWAN interface mayimprove communication through put and reliability at an acceptable costwith a variety of configurations, however, may present undesiredcomplexity and cost in other configurations. Similar advantages anddisadvantages may be implicated with other available network interfacesavailable at a client information handling system 10, such aspeer-to-peer interfaces 126, mesh interfaces 128, access pointinterfaces 130, and wireless access point interfaces 132, all of whichmay or may not follow same network path to the external network ofinterest.

A link aggregation optimizer 124 executing on client informationhandling system 10 manages available network interfaces to help ensureefficient leveraging of communication assets for an optimizedcommunication experience at client information handling system 10. Linkaggregation optimizer 124 weighs the requirements of applications 122against the characteristics of available network interfaces to selectnetwork interfaces for use by each application and to distribute networkcommunications between the network interfaces in an optimal manner. Fora given application executing on a client information handling system,link aggregation optimizer 124 may, for example, select a networkinterface to handle all outbound network communication, another networkinterface to handle all inbound network communications, and a thirdnetwork interface to handle all background data transfer functions of anapplication. As another example, one active application, such as a game,may be assigned all available network interfaces, such as all WiGiGnetwork interfaces, while other applications, such as email, arerestricted to one network interface, such as WiFi. By associatingapplication functions with particular communication needs, applications122 have increased communication efficiency for an improved end userexperience. Further, application network interface selection anddistribution may be adjusted as conditions at client informationhandling system 10 change. For instance, applications that fall out offocus may have their communication priority decreased with networkpackets distributed to a less reliable network interface. As anotherexample, communication characteristics may shift over time for thedifferent network interfaces so that changes in application networkpacket distribution may be performed to optimize network communicationsas the conditions change. Such shifts may occur with peer-to-peer andmesh network interfaces as the systems supporting the interfaces changepositions, as the wireless bands involved become more and less busy, andas other processing and communication tasks otherwise impact the linkquality and reliability.

Referring now to FIG. 12, a flow diagram depicts a process for adaptingavailable network interfaces to support an aggregated communication linkat a client information handling system application. The process startsat step 134 with analysis of all active network interfaces at the clientinformation handling system. FIG. 13 depicts various tables maintain bya link aggregation optimizer to aid in the analysis and selection ofnetwork interfaces for a client application. As illustrated by theexample table of FIG. 13, link analysis includes a variety of networkinterface characteristics 146, such as link capacity, link quality, linkreliability, link cost and link power efficiency. At step 136, ananalysis is performed of the client and network device subscription andpower status. FIG. 13 illustrates device requirements that may relate toboth the client communicating the network packets and the networkdevices potentially involved in the communication paths if selected bythe link aggregation optimizer. For example, WWAN network interfaces mayinclude a flat or variable plan so that the cost could vary based onplan rates. As another example, a peer or mesh network interface devicecould lean on a WWAN network interface to access an external networkthat involves a different cost. In another example, the availability ofexternal power versus the battery charge state of a client and networkdevices impact that selection of network interfaces that have variedpower consumption. For instance, shorter range WiGiG 60 GHz interfacestend to have lower transmit powers that may be preferred where a clientinformation handling system has limited power availability.Implementation of higher power consuming network interfaces may still beperformed, for instance, with network packets that have quality ofservice demands while lower power and less reliable network interfacesare used to perform application functions that demand less reliable orlower quality network interfaces.

At step 138, an analysis of network traffic workload is performed basedupon detected traffic patterns and previous network traffic history. Asan example of network traffic workload analysis, a static white list maybe kept that defines the network traffic requirements of clientapplications. When an application initiates that is on the client whitelist, the values stored on the white list provide an initialization setof parameters from which further optimization may be performed. In oneembodiment, if client responsiveness remains within a threshold thatindicates adequate network communication rates, further optimization mayprove unnecessary so that the network interface is maintained as definedby the whitelist. Alternatively, the application white list may beupdated as network conditions and application operating constraintschange. For example, observations about traffic patterns and trafficquality are compared against traffic requirements based upon successfuland lost packet metrics to adjust distribution of network packetsthrough the plural network interfaces used by each application. Asdepicted by the workload table 150 of FIG. 13, each application may havedifferent available network interfaces assigned as workload requirementsshift with a dynamic shift of network traffic associated withapplications between multiple network interfaces. For example, under oneexample set of conditions, an application may choose to communicatethrough multiple interfaces with 20% of packets through a more reliablenetwork interface, such as Ethernet, while the remaining 80% of packetspass through a less reliable network interfaces, such as a mesh network,based upon loading and alignment with defined use cases.

Referring now to FIG. 14, a block diagram depicts various factorsconsidered in assignment of network interfaces to an application anddistribution of network packets between the network interfaces.Application 60 interfaces with a link selector 152 that referencesavailable network interfaces established for the application in linkaggregation table 64 to determine which network interfaces to use forapplication network packets sent from application 60. As a startingpoint, link selector 152 references network interfaces defined by awhitelist 154 to initiate the distribution of network packets from theapplication to the external network. An advantage of reference towhitelist 154 is that sharing the whitelist contents with an accesspoint 26 ensures that a similar balance of return network packets willbe achieved by the access point for inbound packets from the externalnetwork to the application. That is, the access point will performdistribution of packets to the application through the networkinterfaces available to the access point based upon parameters derivedfrom whitelist 154. Over time, a whitelist analyzer 156 adjusts thewhitelist parameters to reflect improvements for initialization by theapplication of an external network interface with plural local networkinterfaces. In the example embodiment, the whitelist maintains optimalinitialization parameters for the application, however, in alternativeembodiments more recent data may be kept that aims to open the networkinterfaces closer to an optimal configuration.

Bandwidth and subscription parameters 158 define data capacity and costfor different network interfaces. In one embodiment, link selector 152manages distribution of network packets between available networkinterfaces to obtain a minimum data capacity needed by the applicationwith a minimum cost. For instance, link selector 152 may configureapplication 60 to communicate network packets over a mesh network and aWiFi network, each lacking guaranteed service but togetherwell-exceeding the application's data transfer needs. In an enterpriseenvironment, wireless communication conditions may vary as enterpriseemployees have changes in data transfer needs so that network capacitymay fall below the needs of application 60. In such a situation, linkselector 152 may have a more guaranteed network capacity set aside torely upon as other network interfaces lose capacity. Generally,peer-to-peer and mesh networks will have a greater number of variablesthat impact capacity than standard interfaces with fixed access points.However, when peer-to-peer and mesh networks become available, theincreased bandwidth may provide a substantial improvement in how networkcommunication is perceived by an end user, thus providing an improvedend user experience. Traffic workload parameters 160 provide real timefeedback that link selector 152 may reference to adjust networkinterface selection that meets application 60 needs. In addition,quality of service parameters 162 define the rate of acceptable packetmisses that application 60 will tolerate. For instance,telecommunication applications that carry live voice or video feeds willwant network interfaces that have less loss so that real time datatransfers communicate more clearly. In an example embodiment, forinstance, voice of a video conference application may be carried with aguaranteed network service, such as a WWAN, while video is communicatedthrough broader bandwidth but less guaranteed network interfaces, suchas 60 GHz mesh interfaces.

As wireless communication devices proliferate in enterprises andresidences, link selector 152 is provided with a greater number ofselections to establish network links for applications. For example, ina cubicle environment a client information handling system may haveseveral short range but high bandwidth 60 GHz network interfacesavailable, such as docking station, a printer, a display or a neighbor'sdocking station. By establishing a mesh network interface where stable60 GHz interfaces are available, a portable information handling systemhas an opportunity to obtain both quality of service and bandwidthwithout cost. If the user moves the portable information handling systemso that mesh networks become less reliable, link selector 152 may shiftthe network traffic towards more reliable long range network interfaces,such as WiFi, while supplementing bandwidth as mess or peer-to-peerinterfaces become available. Where a mesh network egresses the localnetwork at an access point having a link aggregation table that definesan aggregate address for the application, the multiple networkinterfaces work together invisible to the target of the application. Forexample, even where a mesh and WiFi network interface egress the localnetwork at different access points, the sharing of a link aggregationtable between the access points ensures outbound network packets willcommunicate with a common aggregate source Internet Protocol address andport. To manage the multiple wireless network interfaces within SpecificAbsorption Requirements, an SAR module 164 monitors transmissions andadjusts network traffic based upon set radiofrequency limits, which maybe limited across transmission of multiple wireless network interfaceradios.

Referring now to FIG. 15, an example flow diagram depicts a process foradaptive transmission of network packets with wireless networkinterfaces. For each wireless interface supported by client informationhandling system 10, SAR limits tracked by SAR parameters 164 may includeradio transmit time or a count of network packets sent by each radio sothat an estimate of total radio frequency transmit energy is kept aseach wireless network interface remains live. For example, transmissionsare tracked over a window of time against a threshold of allowedtransmissions during a defined time period. In the example embodiment,total transmissions are tracked based upon a credit system in a rotatingbuffer that counts packets to reduce the credit at transmission and addscredits back once the defined time period expires from the time oftransmission, such as every minute. Wireless network radios transmit atfull strength while the radio frequency energy remains below a thresholdbecause full power radio transmissions tend to improve network packettransmission effectiveness. As total radio frequency energy over adefined time period approaches a SAR threshold, link selector 152 mayimplement several options to reduce overall transmit power of theradios. One option is to reduce radio transmit power so that thetransmitted signal has less strength that maintains total radiatingbelow a SAR limit. Another option is to alter the distribution ofoutbound network packets so that a greater number are sent with wiredinterfaces or with a wireless interface that has less restrictive SARlimits, such as in a different frequency band. Yet another option is toconfigure the application to send network packets from a wired networkinterface and receive network packets at wireless network interfaces.When receiving wireless signals at a wireless network interface device,SAR limits are not typically implicated. Thus, network packets receivedthrough mesh and peer-to-peer interfaces provide a SAR free option toextend application receive bandwidth even where the number of wirelessnetwork interfaces has to be reduced to prevent excessive SAR exposure.The estimate of transmitted radio frequency energy may be kept bycounting network packets so that the application can independentlyestimate if and when wireless network interface outbound bandwidth willbe implicated by the SAR limit. In one alternative embodiment, SARexposure may be adjusted by adaptively modifying Modulation, Code Scheme(MCS) based upon the wireless interface and having a higher MCS whenpackets are distributed to multiple interfaces.

In various embodiments, bandwidth, power and SAR constraints arecumulatively considered to optimize an end user experience. As anexample, an application may rely upon wired network communication, suchas through a docking cable or Ethernet interface, for communicatinginformation that an end user accesses frequently. At the same time,background tasks, such as backing up an information handling system tonetwork storage, may be handled with broadband network interfaces thatthrottle transmissions to remain within SAR limits, such as through amesh network. Processing tasks that have lower priorities may rely onless reliable mesh networks that communicate on a best efforts basis andshift to more reliable network interfaces as end user priorities shift.For instance, a gaming application may establish Ethernet communicationsto send real time data, such as interactions with other gamers, whilerelying on higher bandwidth mesh network communications to downloadbackground graphics for which the application does not have an immediateuse. As the end user enters a portion of the game that calls for thegraphics, download of the graphics may then shift to a more reliablenetwork interface, such as WiFi or Ethernet, until the application isprepared to enter that portion. Dynamic allocation of networkcommunication tasks at the client provide an optimum end user experiencethat leverages all available communication mediums. In another exampleembodiment, communication within a local area network is enhanced byproviding applications with access to multiple network interfaces, suchas to support local communications that do not extend to an externalnetwork like the Internet. For instance, an application may assignpartial network communication through a mesh or peer-to-peer networkthat projects information to a television while assigning other networkcommunication through a separate network interface, such as Ethernet. Anapplication is provided with a powerful communication tool thatdynamically distributes packets between network interfaces so that theapplication can target communication goals on the fly, such as datarate, quality of service and reliability. For example, shifting betweenmesh and WiFi interfaces at a portable information handling system asthe end user walks through an enterprise location lets the applicationdynamically shift network packet traffic on a packet-by-packet basis aswireless signal strength changes on each network interface. Forinstance, as mesh network signal strength weakens, the application sendsa greater percentage of packets through WiFi and vice versa.

Although the present invention has been described in detail, it shouldbe understood that various changes, substitutions and alterations can bemade hereto without departing from the spirit and scope of the inventionas defined by the appended claims.

What is claimed is:
 1. An information handling system having pluralnetwork interfaces, the information system comprising: a processoroperable to execute instructions to process information; memoryinterfaced with the processor and operable to store the instructions andinformation; plural network interfaces operable to communicateinformation with a network, the plural network interfaces including atleast one wireless network interface that communicates with radiosignals; wherein the wireless network interface tracks a number ofnetwork packets communicated in a predetermined time period and reducesradio signal transmit strength if the number of packets exceeds athreshold.
 2. The information handling system of claim 1 wherein: thethreshold varies based upon radio signal transmit strength of thewireless network interface.
 3. The information handling system of claim1 further comprising: a link optimization module that selects from theplural network interfaces to communicate network packets from anapplication executing on the processor; wherein the link optimizationmodule applies plural factors to select from the plural networkinterfaces, the plural factors including at least the number of networkpackets sent by radio from the information handling system.
 4. Theinformation handling system of claim 3 wherein: the link optimizationmodule sends network packets from the application through plural networkinterfaces by translating the network packet Internet Protocol addressat the network layer; and the link optimization module selects theplural network interfaces in part based upon the number of wirelessradio network packets sent by plural of the network interfaces.
 5. Theinformation handling system of claim 3 wherein the link aggregationoptimizer directs all outbound traffic of an application through wirednetwork interfaces and directs all inbound traffic of the applicationthrough wireless network interfaces.
 6. The information handling systemof claim 1 wherein the wireless network interface directs outboundnetwork packets of an application to a first or second wirelessinterface.
 7. The information handling system of claim 1 wherein thelink aggregation optimizer monitors traffic of the plural networkinterfaces and adjusts application network packet distribution throughthe plural network interfaces to communicate wireless network packetsthrough a wireless network interface having a number of packets of lessthan the threshold.
 8. The information handling system of claim 4wherein at least one of the plural network interfaces comprises apeer-to-peer network interface with a peer information handling system,the link aggregation optimizer assigning application network packets tothe peer-to-peer network interface based upon the number of packetsrelative to the threshold.
 9. The information handling system of claim 4wherein at least one of the plural network interfaces comprises a meshnetwork interface with a mesh information handling system, the linkaggregation optimizer assigning application network packets to the meshnetwork interface based at least in part upon the number of packetsrelative to the threshold.
 10. A method for communicating between aninformation handling system and an external network, the methodcomprising: generating network packets with an application executing onthe information handling system; sending the network packets through oneor more of plural network interfaces including at least one wirelessnetwork interface; tracking transmit time during a predetermined timewindow for at the at least one wireless network interface; and adjustingthe sending if the transmit time within the predetermined time windowapproaches a threshold.
 11. The method of claim 10 wherein: trackingtransmit time further comprises counting the number of packets sent bythe wireless network interface during the predetermined time window;adjusting the sending comprises adjusting a transmit power applied tosend the network packets with the at least one wireless networkinterface by lowering the transmit power.
 12. The method of claim 10wherein: adjusting the sending comprises throttling the rate at whichthe at least one wireless network interface sends the network packets.13. The method of claim 10 wherein: adjusting the sending comprisestranslating the network packets to send through a wired networkinterface.
 14. The method of claim 10 further comprising: allocating thenetwork packets of the application to send from plural networkinterfaces by selectively translating network packet addresses so thatthe transmit time remains below the threshold.
 15. A method forcommunication between a client information handling system and anexternal network, the method comprising: establishing plural networkinterfaces between the client information handling system and externalnetwork; executing an application on the client information handlingsystem, the application generating information to communicate to theexternal network and receiving information from the external network;communicating the application information as network packets; trackingwireless transmissions of the network packets sent by at least a one ofthe network interfaces having wireless communication; in response to thetracking reaching a threshold, adapting communication of the networkpackets to maintain the wireless transmissions below the threshold. 16.The method of claim 15 wherein: tracking wireless transmissions furthercomprises counting packets sent by wireless network interface within atime window and comparing the counted packets to a threshold number ofpackets; and adapting communication further comprises reducing transmitpower of the wireless transmission.
 17. The method of claim 15 wherein:tracking wireless transmissions further comprises tracking transmit timeof network packets sent by the wireless network interface within a timewindow and comparing the transmit time to a threshold transmit time; andadapting communication further comprises throttling the number of thenetwork packets sent by the wireless transmissions.
 18. The method ofclaim 17 wherein the wireless transmissions comprise wireless local areanetwork transmissions.
 19. The method of claim 15 wherein adaptingcommunication further comprises communication of outbound networkpackets through a first set of network interfaces and communication ofinbound network packets through the wireless network interface.
 20. Themethod of claim 19 wherein the wireless network interface comprises amesh network interface.
 21. The method of claim 15 wherein adaptingcommunication of the network packets to maintain the wirelesstransmissions below the threshold further comprises modifying thewireless transmission Modulation Coding Scheme (MCS).